Cyril William Habiger

42601320, Apr 7, 1981

Aug 6, 1979

6/108909

Cyril W. Habiger - Joliet IL

Caterpillar Tractor Co. - Peoria IL

F15B 1301

251297

PCT No. PCT/US 79/ 00573 Sec. 371 Date Aug. 6, 1979 Sec. 102(e) Date Aug. 6, 1979 PCT Filed Aug. 6, 1979 Conventional directional control valves and the like normally include relatively complex and spatially separated centering and detent mechanisms for selectively maintaining a valve spool at centered and detent-held positions, respectively. Such valves are normally bulky and the casings therefor, primarily since they require machining, cannot be manufactured by die-casting methods. This invention overcomes the above problems by providing for the precise positioning of a valve spool (11) in its centered position by interassociating and engaging a centering mechanism (17) with a detent mechanism (30) by a stop (27), defined on a retainer (24) of the detent mechanism (30).

40930920, Jun 6, 1978

Mar 24, 1976

5/669936

Cyril W. Habiger - Joliet IL
Tom E. Robinson - Peoria IL

Caterpillar Tractor Co. - Peoria IL

B66F 920

214674

The invention is concerned with an improvement in a load lifting apparatus which comprises a primary load member pivotally mounted about a generally horizontal axis on a frame, a tilt cylinder and a tilt piston movable relative to one another pivotally connected to the frame and the primary load member to provide impetus for pivotal movement therebetween, a secondary load member movable relative to the primary load member, a lift cylinder and a lift piston movable relative to one another connected to the primary load member and the secondary load member to provide impetus for linear relative movement therebetween, tilt cylinder valve means for controlling flow of pressurized fluid from pump means to the tilt cylinder and lift cylinder valve means for controlling flow of pressurized fluid from the pump means to the lift cylinder. The improvement of the invention provides protection which prevents the apparatus from overbalancing. The improvement operates by sensing a moment created by a load on the apparatus.

40966941, Jun 27, 1978

Jul 5, 1977

5/813029

Cyril W. Habiger - Joliet IL
Leon E. Hicks - Joliet IL

Caterpillar Tractor Co. - Peoria IL

F15B 1518
F15B 1116

60459

A fluid drive assembly has a pump, a variable displacement motor, a fluid circuit connecting the pump to the motor, and an actuator device for controlling the displacement of the motor. The actuator device is movable between a first position at which the displacement of the motor is at a preselected maximum and a second position at which the displacement of the motor is at a preselected minimum. A control system for the fluid drive assembly includes a source of fluid at a first preselected pressure value. A valve device is connected to the source of fluid and to the actuator device for controlling the fluid flow therebetween and is movable between a first position at which the source of fluid is in communication with the actuator device and a second position at which the source of fluid is blocked from communication with the actuator device. A first device automatically moves the valve device to the second position in response to the fluid pressure in the fluid circuit exceeding a second preselected pressure level. A second device retains the valve device in the first position until the fluid pressure in the fluid circuit decreases from the second preselected pressure level to a third preselected pressure level.

42134846, Jul 22, 1980

May 30, 1978

5/910250

Cyril W. Habiger - Joliet IL

Caterpillar Tractor Co. - Peoria IL

F16K 1118

1376361

A control apparatus has a single control handle, first and second work elements, and first and second ramps each contacting a respective work element. Apparatus is further provided for selectively, progressively pivoting only one of the ramps in response to controllably moving the single control handle. One of the ramps pivotally moves in response to moving the handle in a first plane to a first position and in a different second plane from a first toward a second position. The other ramp pivotally moves in response to moving the handle in the first plane to a second position and in a different third plane from a first toward a second position. Respective work elements are thereby moved between a plurality of positions for controlling an operation such as the flow of fluid through associated, respective valves.

40971961, Jun 27, 1978

Jun 1, 1976

5/692178

Cyril W. Habiger - Joliet IL

Caterpillar Tractor Co. - Peoria IL

F04B 130

417222

The invention is concerned with an improvement in a pump having a pump body, a swash plate the rotational position of which controls the displacement of the pump and means mounting the swash plate for rotation about an axis generally centrally thereadjacent. The improvement serves to control the pump output. In a broad sense, the improvement comprises means internal of said pump body and acting between said pump body and said swash plate for biasing the swash plate towards a zero displacement position corresponding to a minimum displacement of the pump, and means responsive to discharge pressure of the pump reaching a first magnitude for overriding the biasing means and rotating the swash plate towards a full displacement position corresponding to a maximum displacement of the pump said overriding means comprising servo valve means within said pump body and pilot pump means acting to initially shift said servo valve means to allow discharge pressure to be applied in opposition to said biasing means.

39525155, Apr 27, 1976

Feb 20, 1975

5/551465

Cyril W. Habiger - Joliet IL
William D. McMillan - Joliet IL
David L. Persson - Chillicothe IL
Glenn E. Ferre - late of Peoria IL

Caterpillar Tractor Co. - Peoria IL

F16H 3946

60447

A hydrostatic unit of the type contemplated by the present invention includes one or more pump and motor combinations interconnected by means of a conventional closed loop. Controls for the hydrostatic unit include a speed control and vent valve assembly as well as a venturi manifold which functions to normally establish a selected pressure differential in a pair of supply conduits. In order to automatically regulate displacement of each pump unit in response to both engine or prime mover speed and instant load conditions, an underspeed actuator valve unit is hydraulically responsive to the differential pressure in the two conduits and also to changes in output pressure developed by the pump unit.

40941450, Jun 13, 1978

Jun 16, 1977

5/807277

Cyril W. Habiger - Joliet IL

Caterpillar Tractor Co. - Peoria IL

F16H 3946

60447

An underspeed actuator has a piston connected to a control means of a first pump driven by a prime mover and is movable between a first position at which the first pump is at minimum displacement and a second position at which the first pump is at maximum displacement. The underspeed actuator has first and second actuating chambers at opposite ends of the piston and a biasing device urging the piston toward the first position. The piston is movable between the first and second positions in response to pressure differential in said first and second chambers. A signal device controllably develops first and second control signals in response to the operating speed of the prime mover. First and second conduits deliver said first and second control signals to said first and second chambers, respectively. A shunt valve is connected to the first and second conduits for passing fluid expelled from the first chamber to the second chamber in response to said flow of fluid exceeding a preselected flow rate.

40288900, Jun 14, 1977

Jan 23, 1976

5/651887

Cyril W. Habiger - Joliet IL
Donald L. Hopkins - Joliet IL

Caterpillar Tractor Co. - Peoria IL

F04B 126

60443

A piston pump having a housing and an angularly adjustable swash plate for controlling piston displacement and the flow of fluid discharged from the pump has control means for controllably positioning the swash plate in response to a load pressure.